Supplies: Orange fleece (amount needed varies based on the size of your child, but one yard is probably plenty)
Glue gun or craft glue
1/2" or 3/4" elastic (length depends on size of neckline)
1" or 2" elastic (length depends on size of waistline)
To begin, measure your child at the following locations -
elbow to elbow
top of shoulder to top of shoulder
underarm to top of shoulder
Using your elbow to elbow measurement, cut your fleece this wide (my 4 year old measures 20").
Using your top of shoulder to top of shoulder measurement, cut a semi-circle out of the fold of the fleece. This is now your neckline.
Turn your fleece to the wrong side and fold down the edge of your neckline to make a casing (you don't need to fold under the raw edge - fleece won't fray). Leave a 1 1/2" opening to thread your elastic.
Thread your elastic through, stopping to try on your child before sewing the overlapped edges of elastic together and sewing shut your opening.
Try your costume back on your child and mark where you want the armholes to be.